indexing

mystring = "abcdefghijklmnopqrstuvwxyz"
mystring[0]
#  'a'
mystring[-1]
#  'z'
mystring[1:5]
#  'bcde'

methods

mystring = "hELLO you"
mystring.upper()
#  'HELLO YOU'
mystring.lower()
#  'hello you'
mystring.capitalize()
#  'Hello you'
mystring.isdigit()
#  False
mystring.split()
#  ['hELLO', 'you']
mystring.split("LL")
#  ['hE', 'O you']
mystring.strip("h")
#  'ELLO you'

membership operators

'abc' in 'abcdefghijklmnopqrstuvwxyz'
#  True
'ABC' not in 'abcdefghijklmnopqrstuvwxyz'
#  True